@book{71168,
	author = {Hansen, J. S. and Kelley, John E. and United States},
	title = {Erosion testing of potential valve materials for coal gasification systems},
	publisher = {Dept. of the Interior, Bureau of Mines},
	year = {1979.},
	series = {Report of investigations - Bureau of Mines ; 8335},
	address = {[Washington]}
}